Cryptosporidium Stool Antigen Test (Qualitative)

What This Test Measures

The test looks for specific genetic material (antigen) from Cryptosporidium parasites in your stool. This helps determine if you have an active infection caused by these microscopic parasites, which can lead to symptoms like watery diarrhea, stomach cramps, and nausea.

Why It’s Ordered

Your healthcare provider may recommend this test if you have persistent diarrhea (lasting more than a few days), especially if it’s unexplained, bloody, or accompanied by other symptoms like weight loss or fatigue. It’s also used in certain settings like hospitals or long-term care facilities to monitor outbreaks or in immunocompromised individuals, such as those with HIV/AIDS or undergoing chemotherapy.

Sample Collection and Preparation

You’ll need to provide a fresh stool sample (collected in a special container) for this test. If testing is done at home, follow the instructions provided to ensure the sample is collected and stored correctly. Some labs may require multiple samples for confirmation, especially if initial results are unclear.

Test Process and Results

The test is typically processed using an immunoassay method to detect the Cryptosporidium antigen. Results are usually available within 24 to 48 hours. A positive result means the parasite is present in your stool, indicating an active infection. A negative result means the test did not detect the parasite at the time of testing, but infection could still be present in other parts of your body or may have cleared without treatment.